Sharing session data
In this section, we explore the following mechanisms for sharing session data in a heterogeneous environment Messaging publish subscribe Once again, when reading this section, it is important to keep in mind that while the solutions can be implemented, one has to consider whether it is desirable to do so, since the alternative is often to eliminate interoperability issues altogether by carrying out a migration from one technology stack to the other. In this scenario, illustrated in Figure 9-10,...
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Machine configuration file 62 Maintainability 498 Maintaining state 281 Manageability 493 managed code 56, 266 Managed Heap 65 Managed Process 39 manifest 61 master repository 47 MBeans 46 MDB 234, 243 meet in the middle interface 102 scenario 103 Memory leaks 32 message request 238 response 238 Message Format 238 Message Headers 239 message payload 239 Message Queue Interface 464 Message Queueing Systems 195 message routing 122 message styles document 431 RPC 431 Message Transformation 240...
Stateful synchronous interaction
Stateful interaction Called code the service holds information conversational state on behalf of the calling code the client across multiple method or function invocations. Synchronous interaction Calling code the client waits for blocks the called code the service to complete its operation before continuing with any further processing itself. Stateful synchronous interaction Interaction between the calling code the client and the called code the service is both stateful and synchronous....
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Figure A-24 Domino Web Engine administration Figure A-24 Domino Web Engine administration Note For Domino 6, the setting Does this server use IIS is not used. Save the Domino Server Document with all the changes. 5. Make sure you have the HTTP Task running on the Domino Server. If not, add HTTP to the ServerTasks line of the Notes.ini file. This guarantees that every time the server starts, the HTTP Task is going to be loaded. ServerTasks Update,Repli To verify the configuration, do the...
Creating the static HTML page
A static HTML page may be easily generated in WebSphere Studio Application Developer. The page must contain a form with the action attribute referencing the the ASP.NET Web application and have the proper variables for propagating data from one application to another. WebSphere Studio will help generate and verify the HTML produced. It will also verify links within the document. For example, if the WS2NETAvgCal cRedirector application did not exist within the current context, it would be...
ActiveX Bridge best practices under NET
We have chosen to implement the ActiveX Bridge as our solution. The following recommendations are made with regard to use of ActiveX Bridge under .NET. Isolate ActiveX Bridge calls into a server-side COM DLL that will execute in its own process space under the control of the Service Control Manager. This will require that you implement the calls to ActiveX Bridge in C . You will then use Interop from .NET languages to access the DLL. Although this may require some small extra code, this...
Installing the Microsoft IIS HTTP plugin
The Microsoft IIS HTTP plugin can be installed as part of the WebSphere Application Server installation. The installation procedure for WebSphere Application Server is documented in the IBM Redbook IBM Application Server V5.0 System Management and Configuration, SG24-6195. To install the plugin, perform a custom install as described in the aforementioned redbook. When prompted for the features that you wish to install under the Web Server Plugins category, select the Microsoft IIS plugin, as...
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Service consumer NET consumer
Our .NET consumer will be implemented as a fat client .NET assembly created in C in a similar manner to that used in previous scenarios. This assembly will use the MQ Classes for .NET to create a properly formatted request message and put it to a queue. Code will also be provided to obtain the response from the queue. 1. Create a new .NET solution. To do this, open Microsoft Visual Studio.NET and create a New Project. Use the Windows Application template from the New Project dialog so that we...
JNI limitations
A limitation in the Java Native Interface JNI prohibits us from loading a Java Virtual Machine more than once in a given process. This means that once you have loaded and initialized the JVM, you cannot unload it or reinitialize it without taking the process in which it is running completely down and back up stopping and restarting your program . Since ActiveX Bridge uses JNI under the covers, this limitation affects our solution. This limitation is significant because, for instance, IIS...
Load balancing and failover
Load balancing and failover capabilities under .NET come from the underlying and supporting technologies upon which it is built. Server clustering has been around since the days of NT and has been enhanced to provide additional features. With clustering, a multi-server Web application can provide service despite hardware failures on individual services. Although clustering is very powerful, it is a non-trivial implementation which must be properly planned in advance. Shared disk storage is...
URL redirection implementation
In keeping with the theme of the book, a simple calculator example was implemented to show a URL redirection solution between WebSphere Application Server and ASP.NET. The application is a simple calculator that takes two numbers, calculates the average, and returns the request to the client. This solution involves the following steps 1. Create a WebSphere application to process form data and the redirection request. 2. Generate a WebSphere static HTML page. 3. Publish the WebSphere HTML and...
URL redirection solution
The URL redirection solution, as shown in Figure 9-13 on page 403, shows the steps involved in using redirection to propagate data from an IBM WebSphere Web application to a ASP.NET application running on IIS. The steps involved to produce this interaction are as follows 1. The thin client requests a static page from the IBM HTTP Server. The server returns the page to the client. 2. The user enters data into the form and submits it back to the IBM HTTP Server. The server examines the URL and...
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Figure A-10 Command line wsdl utility Figure A-10 Command line wsdl utility Note that the name of the Proxy class is the same name given to the Service part in the WSDL file. lt service name FindResCode gt lt port name ResCodeSearchPort lt soap address gt The next step is to compile the file FindResCode.cs with the C .NET compiler csc.exe included in the Microsoft .NET Framework SDK, by issuing the following command from the directory where the proxy class was generated csc nologo out...
Manageability
The use of either WebSphere or .NET has an impact on the way that the infrastructure is managed. There are operational concerns such as initial deployment of an application, maintenance, tuning, etc. Factors related to quality of service such as availability, security, performance can also be identified, reported and corrected using tecniques and features provided with application servers to manage the infrastructure as well as the applications. They provide tools to monitor the applications in...
Transaction management
Transactions are a key ingredient in building remote and distributed applications. By using transactions, remote and distributed applications can run multi-step operations and roll back any or all of these operations if there is a failure. The .NET Framework provides support for the following transactional components Microsoft Message Queuing MSMQ Microsoft Message Queuing support is provided directly through objects in the .NET System.Messaging namespace. This namespace contains the object...
Platform support
The Microsoft .NET Framework is designed for Windows operating system. To run any .NET application, the client or server must have a runtime called.NET redistributable, the same as the Java Runtime in WebSphere environment. The .NET redistributable is freely available on the Microsoft site. For configuring server side application, it is recommended that you use Windows 2000 Server or higher. The following list describes various possible Windows platforms for client and server application. NT...
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Figure 4-89 Stateless asynchronous integration cases 1.c WebSphere Application .NET Application Figure 4-90 Stateless asynchronous integration cases 2.c The solutions we suggest for consideration will be relevant for the following Case a1.c Stateless Asynchronous Integration between Client layer and Client layer, from WebSphere to .NET a recurrent solution candidate for this interaction case. Case a2.c Stateless Asynchronous Integration between Client layer and Client layer, from .NET to...
Session state life cycle 1
The session state life cycle in an ASP.NET application is very similar to that of a J2EE Web application, though, of course, the underlying implementation is different between the two technologies. In ASP.NET, the life of a session state does not begin until the first item is added to the in-memory dictionary. Note, however, that when the first request is received for a user, the session state module will create a new session ID for that user and fire a Session_OnStart event. The session state...
IBM Redbooks
For information on ordering these publications, see How to get IBM Redbooks on page 578. Note that some of the documents referenced here may be available in softcopy only. WebSphere Version 5 Web Services Handbook, SG24-6891 IBM WebSphere V5.0 Security, SG24-6573 IBM WebSphere V5.0 Performance, Scalability and High Availability, SG24-6198 WebSphere Studio Application Developer Version 5 Programming Guide, SG24-6957 IBM WebSphere Application Server V5.0 System Management and Configuration,...
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Figure 11-3 Performance when using SOAP RPC encoding The next test that was performed used SOAP Document style encoding. The performance stays relatively stable when the payload size is increased. Figure 11-4 Performance when using Document style encoding The test using RPC literal encoding shows that it provides the performance benefits of SOAP Document style encoding with a little more work due to the parsing of the XML data. In terms of underlying messaging and transport protocols, let's...
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Figure A-26 Domino HTTP Server - homepage.nsf Figure A-26 Domino HTTP Server - homepage.nsf Making the Domino Objects accessible to .NET and IIS Because the Domino Objects are not included as standard within the .NET Framework Software Developer Kit SDK , there is a tool included in the software called Tlbimp type library imported that reads the Domino COM Type Library domobj.tlb and creates a matching CLR assembly domobj.dll which will be in charge of calling the COM Components. The Tlbimp...
Consuming a Web Service in the business logic tier
The code and procedure for consuming a Web Service in a middleware component is the same as seen in previous samples. Figure 7-9 shows this scenario with a Windows client and a Web client. Figure 7-9 Consuming Web Service in the business logic tier using a .NET client The Windows client uses methods of the business logic, where the business logic invokes Web Services. This hides the actual implementation of the Web Service from the client. This scenario can be used with COM applications which...